Title 24 Reports in San Diego
Most of San Diego sits in California climate zone 7, a zone that does not exist anywhere outside San Diego County. The city's northern inland communities sit in a different one, and that changes the numbers a design has to meet.
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San Diego is split across two climate zones
The Energy Commission places most of the city in zone 7 — downtown, Point Loma, Pacific Beach, La Jolla, Mission Valley and the mid-city neighbourhoods out to the College area. Three northern communities break from it. Rancho Bernardo, Carmel Mountain Ranch and Scripps Ranch, in ZIP codes 92127, 92128 and 92131, are assigned zone 10.
Zone 10 is an inland-valley designation the city shares with Corona, Temecula, Ontario and Rancho Cucamonga. A Scripps Ranch house is therefore held to an Inland Empire energy budget, while a house twenty minutes down Interstate 15 is held to the mildest figures the state recognises. One city, two targets — which is why a set of calculations cannot simply be moved from one San Diego address to another.
Why zone 7 is effectively San Diego's own
Zone 7 is the most tightly bounded of the sixteen. All 125 ZIP codes the Energy Commission assigns to it fall inside San Diego County; no other county holds any part of it. Most projects here are measured against conditions that occur nowhere else in the state, so figures borrowed from another coastal city do not carry across.
Permitting through Development Services
Inside the city limits, permits run through the City of San Diego Development Services Department, and the energy forms travel in the same submittal as the architectural drawings. Additions, garage conversions and accessory dwelling units make up most of the residential volume; tenant improvements and other nonresidential scope run on the NRCC forms instead.
When a plan check comment names Title 24, the usual cause is calculations that no longer describe the sheets — a glazing schedule revised after issue, or a different heat pump specified late in design. Checking the zone before the model is built avoids the more expensive version of that problem, where a Rancho Bernardo or Scripps Ranch project was run against coastal figures and has to be redone.
Common Title 24 Questions in San Diego
- Is my San Diego project in climate zone 7 or climate zone 10?
- Why are Rancho Bernardo and Scripps Ranch a different zone from the rest of the city?
- Can one energy report cover two San Diego addresses?
- What does Development Services expect in the energy submittal?
- Does an ADU in San Diego need an energy report?
- Does replacing windows on its own require an energy report?
- Do San Diego tenant improvements use the NRCC forms?
- What happens when a plan check comment names the energy forms?
San Diego projects fall in California climate zones 7 and 10. The zone drives the envelope and equipment requirements a report has to meet, and a single city can span more than one, so it is confirmed per address.